The only game You've listed that I have is the Witcher 3. I don't notice anything strange in-game. Well, I mean- obviously or I'd be having the same problem, I suppose.
I wonder if you have the map zoomed in in that pic? Looking at some other images of the game I notice that the minimap in other images appears to show a wider area. It may be that the map has a limited resolution and zooming in will cause the pixels of that map to be more apparent. (in some games zooming in on the full-screen map will zoom the minimap)
I'm using a 8GB GTX 1070 as well, but from Gigabyte rather than MSI. I upgraded from a Asus 770 GTX. I did not use DDU- just replaced the card and installed the new drivers.
What Driver version do you have? (Help->System Information from the NVidia Control Panel). I am using 378.92. Perhaps it is an issue introduced in a recent release.
Interestingly, I've also noticed in my searches that a lot of the people having this issue mention using DDU, enough that I cannot help but think it may not be a coincidence.